Pup cats?
Race Director
Joined: May 2000
Posts: 14,542
Likes: 5
Drifting
Joined: Oct 2002
Posts: 1,335
Likes: 76
From: Bedford Va.
I followed the procedure in the link-worked great.
now did it help-I lean towards no. I did heads, cam, pulley
and gutted the pup-cats, stock manifolds with z06 cat back. the hp after tuning was good for my part combination but the torque numbers were fare.
sound level was slightly changed. there were no bad smells or code problems.
hope this helps
now did it help-I lean towards no. I did heads, cam, pulley
and gutted the pup-cats, stock manifolds with z06 cat back. the hp after tuning was good for my part combination but the torque numbers were fare.
sound level was slightly changed. there were no bad smells or code problems.
hope this helps
Le Mans Master
Joined: Oct 2001
Posts: 6,710
Likes: 2
From: Southern California
Probably very little difference, I don't think it's worth doing unless you've already unbolted the exhaust for some other reason. I mean, if you're doing something else that requires the exhaust pipes to be taken off, why not do it? When I installed my tunnel brace, I gutted the pup cats, but I wouldn't have bothered if I didn't have the tunnel brace to install.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Probably very little difference, I don't think it's worth doing unless you've already unbolted the exhaust for some other reason. I mean, if you're doing something else that requires the exhaust pipes to be taken off, why not do it?
maybe more of a performance difference gained on a moderately modded engine.
But, I did notice a deepening of the exhaust sound
I look at it this way.
1. It's a free mod.
2. It may deepen the exhaust tone - especially with Z06 titaniums.
3. It gives this man an ulcer (a little payback for all the hassles he's caused for us automobile enthusiasts):
Race Director
Joined: May 2000
Posts: 14,542
Likes: 5
My distant memory says the pre-cats only do their thing when the car is cold at start-up -- for emissions.
Once the car is warmed up, they supposedly drop out of the loop.
Once the car is warmed up, they supposedly drop out of the loop.
Last edited by EHS; Mar 11, 2005 at 09:36 AM.
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